40 ERICACEAE. Rhododendron. 



R. EUamtschaticum, Pall. A span high : leaves thin and chartaceo-membranaceous, 

 sessile, obovate, or the upper oval, very obtuse, nervose-veined and reticulated, bristly 

 ciliate, shining : sepals large and foliaceous, deciduous : corolla rose-purple, deeply 5-clet't, 

 nearly an inch long : capsule thin. Fl. Ross. i. 48, t. 33 ; Hook. Fl. ii. 43. Rhodothamnus 

 Kamtsehaticus, Lindl. in Paxt. Fl. Card. i. t. 22. Alaska and Aleutian Islands to North 

 Japan, &c. 



2. AZALEASTRUM, Planchon, Maxim. Inflorescence lateral ; the flowers 

 from the same bud as the leafy shoot or from separate 1-3-flowered lateral buds 

 below : scales caducous : leaves deciduous : corolla rotate or approaching cam- 

 panulate : stamens 5 to 10. 



R. albiflorum, Hook. Shrub 2 or 3 feet high, with slender branches, pubescent with 

 slender strigose or silky and some short glandular hairs when young, nearly glabrous 

 in age : leaves membranaceous, oblong, pale green : flowers from separate small buds of 

 the axils of the previous year, nodding on short pedicels : sepals membranaceo-foliaceous, 

 oval or oblong, half the length of the white 5-cleft corolla, as long as the ovoid capsule : 

 stamens 10, included: filaments bearded at the base: stigma peltate-5-lobed. Fl. ii. 43, 

 t. 133, & Bot. Mag. t. 3670 Woods of the northern Rocky Mountains and Oregon to 

 British Columbia. Corolla less than an inch long. 



3. AZALEA, Planehon, Maxim. Inflorescence terminal ; with the umbellate 

 flowers from a separate strobilaceous bud, terminating the growth of the previous 

 year, surrounded at the base by lateral and smaller leaf-buds, developing in 

 spring or early summer ; the thin-scaly bud-scales and bracts caducous or early 

 deciduous : leaves deciduous, glandular-mucronate : calyx small, sometimes minute : 

 corolla chiefly funnelform, glandular-viscid outside: stamens (5 to 10) and style 

 more or less exserted and declined. Azalea, L. chiefly, DC. &c. (with Rhodora, 

 Duhanael). 



# Strobilaceous flower-buds of numerous much imbricated scales: corolla with conspicuous funnel- 

 form tube, slightly irregular limb, and acute oblong lobes: stamens (chiefly 5) and style long- 

 exserted. TP.UE AZALEAS. 



i Pacific States species: flowers more or less later than the leaves. 



R. OCCideiltale, Gray. Shrub 2 to 6 feet high : branches not bristly : leaves obovatc- 

 oblong, nearly glabrous at maturity, but ciliate, thickish, bright green and shining above 

 (1 to 3 inches long): lobes of the 5-parted calyx oblong or oval: corolla white or barely 

 with a rosy tinge and a pale yellow band on the upper lobe, often 2-i inches long : capsule 

 oblong, three-fourths inch long. Bot. Calif, i. 458. A', calendulaceum, Hook. & Arn. Beech. 

 302. Azalea occidentalis, Torr. & Gray, Pacif. R. Rep. iv. 110. California, western foot- 

 hills of the Sierra Nevada through the length of the State, and in the coast ranges, along 

 streams. Fragrance of blossoms sweet, but slightly unpleasant. 



+ -i Atlantic States species (commonly called SWAMP HOXEYSITKLES), all from 3 to Id feet 

 hi"-h and the leaves from obovate to oblong-oblanceolate. Species of Rhododendron, Torr. Fl. 

 N'.'&M. States (1824), 424. 



M- Flowers appearing later than the glabrous leaves, deliciously fragrant. 



R. arborescens, Torr. Few strigose or chaffy bristles leaves (fragrant in drying) 

 merely ciliolate, slightly coriaceous when mature, bright green and shining above, glau- 

 cescent beneath : corolla white or tinged with rose, fully 2 inches long ; the tube and the 

 conspicuous narrow-oblong calyx-lobes sparsely glandular-bristly : stamens and style red. 

 Fl, N. & M. States, 425. Azalea arborescens, Pursh, Fl. i. 152; Gray, Man. ed. 1, 268. 

 A. frarjrans, Raf. Ann. Nat. 12. Alleghany Mountains, Pennsylvania to North Carolina. 

 Foliage exhales the odor of Anthoxanthum in drying. 



R. viscosum, Torr. Branchlets and midrib of the leaves beneath more or less chaffy- 

 Viristlv : leaves more ciliate, an inch or two long, dull or hardly shining above, pale be- 

 neath : calyx very small : corolla white, or with a rosy tinge, sometimes varying to reddish, 

 the outside very glandular-viscid. Fl. N. & M. States, 1. c., & Fl. N. V. i. 439, t. GO. 

 Azalta viscosa, L. (Catesb. Car. i. t. 57); Michx. Fl. i. 150; Emerson, Mass. Rep. ed. 2, 



